Package snowboot. R topics documented: October 19, Type Package Title Bootstrap Methods for Network Inference Version 1.0.
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1 Type Package Title Bootstrap Methods for Network Inference Version Date Package snowboot October 19, 2018 Functions for analysis of network objects, which are imported or simulated by the package. The non-parametric methods of analysis center on snowball and bootstrap sampling for estimating functions of network degree distribution. For other parameters of interest, see, e.g., 'bootnet' package. Depends R (>= 3.3.0) License GPL-3 LazyData TRUE Imports graphics, igraph, parallel, Rcpp, Rdpack, stats, VGAM RdMacros Rdpack RoxygenNote LinkingTo Rcpp Encoding UTF-8 NeedsCompilation yes Author Leticia Ramirez-Ramirez [aut], Kusha Nezafati [aut], Yuzhou Chen [aut], Vyacheslav Lyubchich [aut, cre], Yulia R. Gel [aut] Maintainer Vyacheslav Lyubchich <lyubchich@umces.edu> Repository CRAN Date/Publication :50:06 UTC R topics documented: artificial_networks boot_ci
2 2 artificial_networks boot_dd igraph_to_network lsmi lsmi_cv lsmi_dd lsmi_union plot.snowboot random_network sample_about_one_seed vertboot Index 18 artificial_networks 10 Simulated Networks of Order 2000 with Polylogarithmic (0.1, 2) Degree Distributions A list called "artificial_networks". The length of the list is 10, and each element is a network object of order These networks were simulated using the polylogarithmic (aka Gutenberg Richter law) degree distribution with parameters δ = 0.1 and λ = 2 as shown in the following equations: f(k) = k δ e k/λ /Li δ (e 1/λ ) Li δ (z) = z j /j δ, where λ > 0 (see Newman et al and Gel et al for details). artificial_networks j=1 Format A list containing 10 network objects. Each network object is a list with three elements: degree the degree sequence of the network, which is an integer vector of length n; edges the edgelist, which is a two-column matrix, where each row is an edge of the network; n the network order (number of nodes in the network). The order is Gel YR, Lyubchich V, Ramirez Ramirez LL (2017). Bootstrap quantification of estimation uncertainties in network degree distributions. Scientific Reports, 7, doi: /s x. Newman MEJ, Strogatz SH, Watts DJ (2001). Random graphs with arbitrary degree distributions and their applications. Physical Review E, 64(2), doi: /PhysRevE
3 boot_ci 3 boot_ci Confidence Intervals from Bootstrapped Network Degree Distribution The function calculates bootstrap confidence intervals for the parameters of network degree distribution: probabilities of node degrees f(k) and mean degree µ, where k = 0, 1,... are the degrees. boot_ci(x, prob = 0.95, method = c("percentile", "basic")) x prob method a list with bootstrapped results output of boot_dd. confidence level for the intervals. Default is 0.95 (i.e., 95% confidence). method for calculating the bootstrap intervals. Default is "percentile" (see Details). Details Currently, the bootstrap intervals can be calculated with two alternative methods: "percentile" or "basic". The "percentile" intervals correspond to Efron s 100 prob% intervals (see Efron 1979, also Equation 5.18 by Davison and Hinkley 1997 and Equation 3 by Gel et al. 2017): (θ [Bα/2], θ [B(1 α/2)] ), where θ[bα/2] and θ [B(1 α/2)] are empirical quantiles of the bootstrap distribution with B bootstrap replications for parameter θ (θ can be the f(k) or µ), and α = 1 prob. The "basic" method produces intervals (see Equation 5.6 by Davison and Hinkley 1997): (2ˆθ θ [B(1 α/2)], 2ˆθ θ [Bα/2] ), where ˆθ is the sample estimate of the parameter. Note that this method can lead to negative confidence bounds, especially when ˆθ is close to 0. A list object of class "snowboot" with the following elements: fk_ci mu_ci A matrix of dimensions 2 length(x$fk), where the number of columns corresponds to the number of probabilities f(k) estimated from an LSMI sample. Each column of the matrix is a confidence interval for a corresponding f(k). I.e., the first row of the matrix gives the lower bounds, while the second row contains all upper bounds. A numeric vector of length 2 with lower and upper confidence bounds for the network mean degree µ.
4 4 boot_dd prob method fk mu Confidence level for the intervals. Method that was used for calculating the bootstrap intervals. A vector with an estimate of the degree distribution, copied from the input x$fk. An estimate of the mean degree, copied from the input x$mu. Davison AC, Hinkley DV (1997). Bootstrap Methods and Their Application. Cambridge University Press, Cambridge. Efron B (1979). Bootstrap methods: Another look at the jackknife. The Annals of Statistics, 7(1), doi: /aos/ Gel YR, Lyubchich V, Ramirez Ramirez LL (2017). Bootstrap quantification of estimation uncertainties in network degree distributions. Scientific Reports, 7, doi: /s x. See Also boot_dd net <- artificial_networks[[1]] lsmiestimate <- lsmi_dd(net = net, n.seed = 5, n.wave = 3) bootestimates <- boot_dd(lsmiestimate, B = 10) bootintervals1 <- boot_ci(bootestimates) #Another version of the intervals: bootintervals2 <- boot_ci(bootestimates, method = "basic") boot_dd Bootstrapping Empirical Degree Distribution This function delivers bootstrap estimates of network degree distribution based on an LSMI sample. The bootstrap scheme is non-weighted for seeds (resampling with replacement) and weighted for non-seeds (resampling with replacement, with weights proportional to inverse of the degrees), as described in Section 3.3 by Thompson et al. (2016) and in Algorithm 1 by Gel et al. (2017). boot_dd(x, B = 100, cl = 1)
5 boot_dd 5 x B cl a list that is the output of lsmi_dd, i.e., an estimate of the degree distribution together with all degrees of seeds and non-seeds from an LSMI. a positive integer, the number of bootstrap replications to perform. Default is 100. parameter to specify computer cluster for bootstrapping, passed to the package parallel (default is 1, meaning no cluster is used). Possible values are: cluster object (list) produced by makecluster. In this case, new cluster is not started nor stopped; NULL. In this case, the function will attempt to detect available cores (see detectcores) and, if there are multiple cores (> 1), a cluster will be started with makecluster. If started, the cluster will be stopped after computations are finished; positive integer defining the number of cores to start a cluster. If cl = 1, no attempt to create a cluster will be made. If cl > 1, cluster will be started (using makecluster) and stopped afterwards (using stopcluster). A list object of class "snowboot" consisting of: fkb mub fk mu B A matrix of dimensions length(x$fk) B with B bootstrap estimates of the degree distribution. The bootstrap estimates are computed according to Equation 1 by Gel et al. (2017). A vector of length B with bootstrapped estimates of the network mean degree. The bootstrap estimates are computed according to Equation 2 by Gel et al. (2017). A vector with an estimate of the degree distribution, copied from the input x$fk. An estimate of the mean degree, copied from the input x$mu. The number of bootstrap replications performed. Gel YR, Lyubchich V, Ramirez Ramirez LL (2017). Bootstrap quantification of estimation uncertainties in network degree distributions. Scientific Reports, 7, doi: /s x. Thompson ME, Ramirez Ramirez LL, Lyubchich V, Gel YR (2016). Using the bootstrap for statistical inference on random graphs. Canadian Journal of Statistics, 44(1), doi: / cjs See Also lsmi, lsmi_dd, boot_ci
6 6 igraph_to_network net <- artificial_networks[[1]] lsmiestimate <- lsmi_dd(net = net, n.seed = 5, n.wave = 3) bootestimates <- boot_dd(lsmiestimate, B = 10) igraph_to_network Create a "Network" Object from an igraph Object This function converts an igraph object to an object compatible with snowboot functions. igraph_to_network(in_graph) in_graph An igraph object. To create igraph objects from field data, see graph_from_edgelist, graph_from_data_frame, graph_from_adjacency_matrix, or read_graph. A list that contain elements: edges The edgelist of the network. A two column matrix where each row is an edge. degree The degree sequence of the network, which is an integer vector of length n. n The network order. hex_ring <- igraph::make_ring(6, directed = FALSE, mutual = FALSE, circular = TRUE) net <- igraph_to_network(hex_ring)
7 lsmi 7 lsmi Labeled Snowball with Multiple Inclusions (LSMI) Obtain LSMI samples around several seeds, which can be selected randomly or pre-specified. See Figure 1 by Gel et al. (2017) illustrating the algorithm of sampling around multiple seeds. lsmi(net, n.seed = 10, n.wave = 1, seeds = NULL) net n.seed n.wave seeds a network object that is a list containing: degree the degree sequence of the network, which is an integer vector of length n; edges the edgelist, which is a two-column matrix, where each row is an edge of the network; n the network order (i.e., number of nodes in the network). The network object can be simulated by random_network, selected from the networks available in artificial_networks, converged from an igraph object with igraph_to_network, etc. an integer defining the number of nodes to randomly sample from the network to start an LSMI sample around each of them. an integer defining the number of waves (order of the neighborhood) to be recorded around the seed in the LSMI. For example, n.wave = 1 corresponds to an LSMI with the seed and its first neighbors. Note that the algorithm allows for multiple inclusions. a vector of numeric IDs of pre-specified seeds. If specified, LSMIs are constructed around each such seed. Details If seeds specified, n.seed is not used. A list of length n.seed (or, if seeds are specified, of length length(unique(seeds))), where each element is a list of length n.wave + 1 representing an LSMI produced by sample_about_one_seed. Gel YR, Lyubchich V, Ramirez Ramirez LL (2017). Bootstrap quantification of estimation uncertainties in network degree distributions. Scientific Reports, 7, doi: /s x.
8 8 lsmi_cv See Also sample_about_one_seed, lsmi_union net <- artificial_networks[[1]] a <- lsmi(net, n.seed = 20, n.wave = 2) lsmi_cv Cross-validation to Select an Optimal Combination of n.seed and n.wave From the vector of specified n.seeds and possible waves 1:n.wave around each seed, the function selects a single number n.seed and an n.wave (optimal seed-wave combination) that produce a labeled snowball with multiple inclusions (LSMI) sample with desired bootstrap confidence intervals for a parameter of interest. Here by desired we mean that the interval (and corresponding seedwave combination) are selected as having the best coverage (closest to the specified level prob), based on a cross-validation procedure with proxy estimates of the parameter. See Algorithm 2 by Gel et al. (2017) and Details below. lsmi_cv(net, n.seeds, n.wave, seeds = NULL, B = 100, prob = 0.95, cl = 1, param = c("mu"), method = c("percentile", "basic"), proxyrep = 19, proxysize = 30) net n.seeds a network object that is a list containing: degree the degree sequence of the network, which is an integer vector of length n; edges the edgelist, which is a two-column matrix, where each row is an edge of the network; n the network order (i.e., number of nodes in the network). The network object can be simulated by random_network, selected from the networks available in artificial_networks, converged from an igraph object with igraph_to_network, etc. an integer vector of numbers of seeds for snowball sampling (cf. a single integer n.seed in lsmi). Only n.seeds <= n are retained. If seeds is specified, only values n.seeds < length(unique(seeds)) are retained and automatically supplemented by length(unique(seeds)).
9 lsmi_cv 9 n.wave seeds B prob cl param method an integer defining the number of waves (order of the neighborhood) to be recorded around the seed in the LSMI. For example, n.wave = 1 corresponds to an LSMI with the seed and its first neighbors. Note that the algorithm allows for multiple inclusions. a vector of numeric IDs of pre-specified seeds. If specified, LSMIs are constructed around each such seed. a positive integer, the number of bootstrap replications to perform. Default is 100. confidence level for the intervals. Default is 0.95 (i.e., 95% confidence). parameter to specify computer cluster for bootstrapping, passed to the package parallel (default is 1, meaning no cluster is used). Possible values are: cluster object (list) produced by makecluster. In this case, new cluster is not started nor stopped; NULL. In this case, the function will attempt to detect available cores (see detectcores) and, if there are multiple cores (> 1), a cluster will be started with makecluster. If started, the cluster will be stopped after computations are finished; positive integer defining the number of cores to start a cluster. If cl = 1, no attempt to create a cluster will be made. If cl > 1, cluster will be started (using makecluster) and stopped afterwards (using stopcluster). The parameter of interest for which to run a cross-validation and select optimal n.seed and n.wave. Currently, only one selection is possible: "mu" (the network mean degree). method for calculating the bootstrap intervals. Default is "percentile" (see Details). proxyrep The number of times to repeat proxy sampling. Default is 19. proxysize The size of the proxy sample. Default is 30. Details Currently, the bootstrap intervals can be calculated with two alternative methods: "percentile" or "basic". The "percentile" intervals correspond to Efron s 100 prob% intervals (see Efron 1979, also Equation 5.18 by Davison and Hinkley 1997 and Equation 3 by Gel et al. 2017): (θ [Bα/2], θ [B(1 α/2)] ), where θ[bα/2] and θ [B(1 α/2)] are empirical quantiles of the bootstrap distribution with B bootstrap replications for parameter θ (θ can be the f(k) or µ), and α = 1 prob. The "basic" method produces intervals (see Equation 5.6 by Davison and Hinkley 1997): (2ˆθ θ [B(1 α/2)], 2ˆθ θ [Bα/2] ), where ˆθ is the sample estimate of the parameter. Note that this method can lead to negative confidence bounds, especially when ˆθ is close to 0.
10 10 lsmi_dd A list consisting of: bci A numeric vector of length 2 with the bootstrap confidence interval (lower bound, upper bound) for the parameter of interest. This interval is obtained by bootstrapping node degrees in an LSMI with the optimal combination of n.seed and n.wave (the combination is reported in best_combination). estimate Point estimate of the parameter of interest (based on the LSMI with n.seed seeds and n.wave waves reported in the best_combination). best_combination An integer vector of lenght 2 containing the optimal n.seed and n.wave selected via cross-validation. seeds A vector of numeric IDs of the seeds that were used in the LSMI with the optimal combination of n.seed and n.wave. Davison AC, Hinkley DV (1997). Bootstrap Methods and Their Application. Cambridge University Press, Cambridge. Efron B (1979). Bootstrap methods: Another look at the jackknife. The Annals of Statistics, 7(1), doi: /aos/ Gel YR, Lyubchich V, Ramirez Ramirez LL (2017). Bootstrap quantification of estimation uncertainties in network degree distributions. Scientific Reports, 7, doi: /s x. See Also lsmi, lsmi_union, boot_dd, boot_ci net <- artificial_networks[[1]] a <- lsmi_cv(net, n.seeds = c(10, 20, 30), n.wave = 5, B = 100) lsmi_dd Network Degree Distribution Estimated from Labeled Snowball Sample with Multiple Inclusion (LSMI) lsmi_dd computes an empirical network degree distribution and estimates mean degree based on data from an LSMI sample from a network; see Equations 6 and 7 by Thompson et al. (2016) on the details of the calculations.
11 lsmi_dd 11 lsmi_dd(x = NULL, net,...) x net Details the LSMI sample obtained from the network net, for example, with lsmi function or as a subset of the output by lsmi_union. a network object that is a list containing: degree the degree sequence of the network, which is an integer vector of length n; edges the edgelist, which is a two-column matrix, where each row is an edge of the network; n the network order (i.e., number of nodes in the network). The network object can be simulated by random_network, selected from the networks available in artificial_networks, converged from an igraph object with igraph_to_network, etc.... arguments passed to the lsmi function (ignored if x is specified, see Details). The samples produced with lsmi or lsmi_union contain just node IDs arranged into lists of seeds and waves (no details on the node degrees or other node features). This information is sufficient to study some properties of a network (e.g., network motifs not yet implemented in the package). To estimate a degree distribution or mean degree, both the LSMI sample and the original network object are required. If the LSMI object x is not supplied, the function will attempt sampling an LSMI automatically, using the arguments supplied in "..." that will be passed to the lsmi function. A list object of class "snowboot" consisting of: fk mu ds dns A named numeric vector with estimated probabilities ˆf(k) of degrees k, where k = 0, 1,..., max(c(ds, dns)) (i.e., k ranges from 0 to the maximum node degree observed in the LSMI sample). The names of the vector elements are k. An estimate of the mean degree. An integer vector of degrees of seed nodes. An integer vector of degrees of non-seed nodes (i.e., nodes recorded in the waves of neighbors). Thompson ME, Ramirez Ramirez LL, Lyubchich V, Gel YR (2016). Using the bootstrap for statistical inference on random graphs. Canadian Journal of Statistics, 44(1), doi: / cjs See Also lsmi, lsmi_union, boot_dd
12 12 lsmi_union net <- artificial_networks[[1]] #Obtain an LSMI sample and, at the next step, #use it to estimate the degree distribution: lsmisample <- lsmi(net, n.seed = 5, n.wave = 3) fkestimate1 <- lsmi_dd(lsmisample, net)$fk #Obtain an LSMI sample and estimate the degree #distribution in a single step: fkestimate2 <- lsmi_dd(net = net, n.seed = 5, n.wave = 3)$fk #Use the output of lsmi_union to get the estimate: lsmiunionsample <- lsmi_union(net, n.seeds = c(5, 10), n.wave = 3) fkestimate3 <- lsmi_dd(lsmiunionsample$lsmi_big, net)$fk lsmi_union Snowball Sampling with Multiple Inclusions around Several Subsets of Seeds Obtain one big LSMI with max(n.seeds) seeds and n.wave waves around each and subsample seeds to create smaller LSMIs (with less seeds and/or waves). The function is primarily used in cross-validation. lsmi_union(net, n.seeds, n.wave, seeds = NULL) net n.seeds a network object that is a list containing: degree the degree sequence of the network, which is an integer vector of length n; edges the edgelist, which is a two-column matrix, where each row is an edge of the network; n the network order (i.e., number of nodes in the network). The network object can be simulated by random_network, selected from the networks available in artificial_networks, converged from an igraph object with igraph_to_network, etc. an integer vector of numbers of seeds for snowball sampling (cf. a single integer n.seed in lsmi). Only n.seeds <= n are retained. If seeds is specified, only values n.seeds < length(unique(seeds)) are retained and automatically supplemented by length(unique(seeds)).
13 plot.snowboot 13 n.wave seeds an integer defining the number of waves (order of the neighborhood) to be recorded around the seed in the LSMI. For example, n.wave = 1 corresponds to an LSMI with the seed and its first neighbors. Note that the algorithm allows for multiple inclusions. a vector of numeric IDs of pre-specified seeds. If specified, LSMIs are constructed around each such seed. Details Note that the produced LSMIs are slightly different from those described by Gel et al. (2017). The current R implementation produces smaller LSMIs by subsetting the seeds, not by new sampling of seeds from the network and growing completely new LSMIs, as it was done by Gel et al. (2017). A list with two elements: lsmi_big LSMI with max(n.seeds) seeds (see the argument definition above) and n.wave waves produced by the lsmi function. sequence_seeds A list of length equal to length(n.seeds); each element of the list is a random subset of the seeds IDs, starting from the largest (a set of size max(n.seeds)) to the smallest (a set of size min(n.seeds)). Gel YR, Lyubchich V, Ramirez Ramirez LL (2017). Bootstrap quantification of estimation uncertainties in network degree distributions. Scientific Reports, 7, doi: /s x. See Also sample_about_one_seed, lsmi, lsmi_cv net <- artificial_networks[[1]] a <- lsmi_union(net, n.seeds = c(5, 10, 15), n.wave = 2) plot.snowboot Plot Degree Distribution Estimates Plot LSMI-based point estimates of probabilities of node degrees, ˆf(k), and of mean degree, ˆµ, where k = 0, 1,... are the degrees. The point estimates are supplemented with box-and-whisker plots of bootstrapped values (if the input is a boot_dd output) or element-wise bootstrap confidence intervals (if the input is a boot_ci output).
14 14 plot.snowboot ## S3 method for class 'snowboot' plot(x, k = NULL, plotmu = TRUE, plotlegend = TRUE, col0 = "gray50", lwd0 = 1, colpt = "royalblue3", lwdpt = 2, pchpt = 4, coli = "palegreen3", colibg = "palegreen", length = 0.1, boxwex = 0.4, legendargs = list(x = "topright", cex = 0.9, bty = "n"), las = 1,...) x k plotmu plotlegend col0 output of lsmi_dd, boot_dd, or boot_ci. an integer vector with degrees to plot. By default, all degrees represented in x are plotted. logical value indicating whether to plot the results for mean degree (default is TRUE). logical value indicating whether to plot a legend (default is TRUE). color to plot horizontal zero-line at f(k) = 0. Use NA for no plotting. lwd0 width of the horizontal zero-line at f(k) = 0. colpt lwdpt pchpt coli colibg length boxwex legendargs las color for plotting point estimates. line width for plotting point estimates. point type for plotting point estimates (see argument pch in points). color for plotting lines or borders of box-plots for bootstrap estimates. background color, if plotting boxplots of bootstrapped estimates (see argument border in boxplot). length of arrows, if plotting bootstrap confidence intervals (see argument length in arrows). argument of boxplot function. additional arguments for plotting the legend (see arguments in legend). argument of plot function.... additional arguments to pass to the plot function. net <- artificial_networks[[1]] x <- lsmi_dd(net = net, n.wave = 2, n.seed = 40) plot(x) x2 <- boot_dd(x) plot(x2, k = c(1:10)) x3 <- boot_ci(x2, prob = 0.99) plot(x3, k = c(1:10))
15 random_network 15 random_network Construct Artificial Networks This function constructs an artificial network from a given distribution. Only 11 distributions are available. random_network(n, distrib, param = NULL, degree = NULL, take.p = 0.05) n the number of nodes in the desired network. distrib an atomic character representing the desired degree distribution. User may choose from 11 available distributions: "fixed", "pois", "ztpois", "geom", "nbinom", "ztgeom", "poly.log", "logarithmic", "power.law", "full" (fully connected), or "none" (no element connected). param degree take.p the distribution parameters. If the function is "fixed", param is a vector of degrees. an optional vector of degrees that must be of length n. The default is degree = NULL. a number between 0 and 1 representing the proportion to take for elimination with each iteration. A list consisting of: edges The edgelist of the network. A two column matrix where each row is an edge. degree The degree sequence of the network, which is an integer vector of length n. degree.left A vector of length n that should be all zeroes. n The network order. The order for every network is a <- random_network(1000, "poly.log", c(2, 13))
16 16 sample_about_one_seed sample_about_one_seed Snowball Sampling with Multiple Inclusions around One Network Node This function obtains a labeled snowball with multiple inclusions (LSMI) sample, starting from a single network node called seed. See Figure 1 by Thompson et al. (2016) illustrating the algorithm of sampling around one seed. sample_about_one_seed(net, seed, n.wave = 1) net seed n.wave a network object that is a list containing: degree the degree sequence of the network, which is an integer vector of length n; edges the edgelist, which is a two-column matrix, where each row is an edge of the network; n the network order (i.e., number of nodes in the network). The network object can be simulated by random_network, selected from the networks available in artificial_networks, converged from an igraph object with igraph_to_network, etc. numeric ID of a seed to start the LSMI. an integer defining the number of waves (order of the neighborhood) to be recorded around the seed in the LSMI. For example, n.wave = 1 corresponds to an LSMI with the seed and its first neighbors. Note that the algorithm allows for multiple inclusions. sample_about_one_seed returns a list of length n.wave + 1 containing ID of the seed (1st element of the output list), IDs of nodes in the 1st wave (2nd element of the list),..., IDs of nodes in the wave n.wave ((n.wave + 1)th element of the list). If a wave has no nodes in it, the corresponding element of the output contains NA. Thompson ME, Ramirez Ramirez LL, Lyubchich V, Gel YR (2016). Using the bootstrap for statistical inference on random graphs. Canadian Journal of Statistics, 44(1), doi: / cjs See Also lsmi
17 vertboot 17 net <- artificial_networks[[1]] a <- sample_about_one_seed(net, seed = 1, n.wave = 2) vertboot Bootstrapping a Network with Vertex Bootstrap This function bootstraps the original network using a vertex bootstrap technique. vertboot(m1, boot_rep) m1 boot_rep An adjacency matrix of the original network. A positive integer number, the number of bootstrap replications. A list of bootstrapped networks as adjacency matrices. Snijders TAB, Borgatti SP (1999). Non-parametric standard errors and tests for network statistics. Connections, 22(2), graph_ex <- igraph::graph_from_edgelist(artificial_networks[[1]]$edges) m1 <- igraph::as_adjacency_matrix(graph_ex) m1 <- as.matrix(m1) vertboot_out <- vertboot(m1, 20)
18 Index Topic datasets artificial_networks, 2 arrows, 14 artificial_networks, 2, 7, 8, 11, 12, 16 boot_ci, 3, 5, 10, 13, 14 boot_dd, 3, 4, 4, 10, 11, 13, 14 boxplot, 14 detectcores, 5, 9 graph_from_adjacency_matrix, 6 graph_from_data_frame, 6 graph_from_edgelist, 6 igraph_to_network, 6, 7, 8, 11, 12, 16 legend, 14 lsmi, 5, 7, 8, 10 13, 16 lsmi_cv, 8, 13 lsmi_dd, 5, 10, 14 lsmi_union, 8, 10, 11, 12 makecluster, 5, 9 plot, 14 plot.snowboot, 13 points, 14 random_network, 7, 8, 11, 12, 15, 16 read_graph, 6 sample_about_one_seed, 7, 8, 13, 16 stopcluster, 5, 9 vertboot, 17 18
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